求一篇英文文献

题目：An examination of the unusual susceptibilities of aminoglycans to enzymatic hydrolysis
作者：Yalpani, M. : Pantaleone, D.
文献摘要：

The hydrolytic susceptibilities of aminoglycans, including chitosan, chitin, water-soluble chitin, chitin azure, and alpha-(1 leads to 4)-poly(galactosamine), to a series of commercial enzyme preparations were examined. An unexpectedly large number of enzyme preparations gave rise to varying degrees of aminoglycan hydrolysis. Remarkably, several of these enzyme preparations displayed lytic activities towards chitosan that equaled or surpassed those of established catalysts with chitosanolytic activities, such as chitinase and lysozyme. Thus, based on their dose-response profiles, a number of proteases, such as pepsin, bromelain, ficin, and pancreatin, were more efficient catalysts for chitosan hydrolysis than a commercial chitinase (Serratia marcescens) and lysozyme preparation. For a cellulase, hemicellulase, lipase, and protease ev